CN108966117B - Information transmission method for road man in weak situation and mobile device and system thereof - Google Patents
Information transmission method for road man in weak situation and mobile device and system thereof Download PDFInfo
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- 238000004891 communication Methods 0.000 claims description 48
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- 230000008569 process Effects 0.000 description 5
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/005—Traffic control systems for road vehicles including pedestrian guidance indicator
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/023—Services making use of location information using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/16—Anti-collision systems
- G08G1/166—Anti-collision systems for active traffic, e.g. moving vehicles, pedestrians, bikes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0289—Congestion control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/12—Messaging; Mailboxes; Announcements
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Abstract
A message transmission method for a road user with weakness, a mobile electronic device and a system thereof are provided, wherein the method is suitable for a first mobile device of a first road user with weakness and comprises the following steps. Whether a target mobile device exists in a preset range of the first road user with weakness is judged, wherein the target mobile device is a mobile device which broadcasts a personal safety message. When the target mobile device exists in the preset range, whether the first personal safety message is to be broadcast or not is judged according to the relative distance between the target mobile device and the intersection and the relative distance between the target mobile device and the first mobile device. When the target mobile device is not present in the predetermined range, the first personal safety message is broadcast.
Description
Technical Field
The present disclosure relates to a technology for transmitting information of a road man for weak use.
Background
The current networked automobile market focuses on V2X (Vehicle to event) communication software and system integration, where the Vehicle to pedestrian (V2P) level is of great interest. In a general V2P security application system, a mobile vehicle can acquire the position, direction, and longitude and latitude of the vehicle itself through its GPS, and communicate with a neighboring weak road-user by periodically broadcasting Basic Security Message (BSM) packets using, for example, a Short-Range Communications (DSRC).
On the other hand, in the security application system of the pedestrian-to-vehicle (P2V), a Personal Security Message (PSM) packet can be actively broadcasted through the mobile device of the weak road man to communicate with the neighboring vehicles, so as to secure the self security. However, when the number of road users exceeds the bandwidth load of the network, the transmission of a large amount of messages may cause congestion in the network, and the security of the road users is threatened.
In view of the above, the present disclosure provides a message transmission method, a mobile device and a system thereof, which can reduce the sending amount of personal security messages to effectively avoid network congestion.
Disclosure of Invention
In an exemplary embodiment of the disclosure, the message transmission method is applied to a first mobile device of a first weak road user and includes the following steps. Whether a target mobile device exists in a preset range of the first road user with weakness is judged, wherein the target mobile device is a mobile device which broadcasts a personal safety message. When the target mobile device exists in the predetermined range, whether a first personal safety message of the first mobile device is to be broadcast is judged according to a relative distance between the target mobile device and the intersection and another relative distance between the target mobile device and the first mobile device. When the target mobile device is not present in the predetermined range, the first personal safety message is broadcast.
In an exemplary embodiment of the disclosure, the mobile device is held by a first weak road user and includes a positioning module, a communication module, a memory and a processor, wherein the processor is coupled to the positioning module, the communication module and the memory. The positioning module is used for detecting the position of the mobile device. The communication module is used for broadcasting and receiving messages. The memory is used for storing data. The processor is used for judging whether a target mobile device exists in a preset range of the first disadvantaged passerby, wherein the target mobile device is a mobile device which broadcasts a personal safety message. When the processor determines that the target mobile device exists in the predetermined range, whether to broadcast a first personal safety message of the first mobile device is determined according to a relative distance between the target mobile device and the intersection and another relative distance between the target mobile device and the mobile device. When the processor determines that the target mobile device is not within the predetermined range, a first personal safety message is broadcast through the communication module.
In an exemplary embodiment of the disclosure, the message transmission system includes at least one vehicle and at least one mobile device of a road user with weakness, wherein the mobile device includes a first mobile device of a first road user with weakness. The first mobile device determines whether a target mobile device exists in a predetermined range of the first road user with weakness, wherein the target mobile device is a mobile device which broadcasts a personal safety message to the vehicle and the first mobile device. When the target mobile device exists in the preset range, the first mobile device judges whether to broadcast a first personal safety message to the mobile devices of the vehicle and other road users with weakness according to the relative distance between the target mobile device and the intersection and the other relative distance between the target mobile device and the first mobile device, wherein the first personal safety message is the personal safety message of the first mobile device. When the target mobile device is not present in the predetermined range, the first mobile device broadcasts the first personal safety message.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a block diagram illustrating a message transmission system for a road user with weak condition according to an exemplary embodiment of the present disclosure.
Fig. 2 is a flowchart illustrating a message transmission method for a road user with weak condition according to an exemplary embodiment of the disclosure.
Fig. 3 is a flowchart illustrating a message transmission method for a road user with weak condition according to another exemplary embodiment of the disclosure.
Fig. 4 is a schematic diagram illustrating a traffic message transmission system according to an exemplary embodiment of the disclosure.
Fig. 5 is a schematic diagram illustrating a traffic message transmission system according to another exemplary embodiment of the disclosure.
Fig. 6 is a schematic diagram illustrating a traffic message transmission system according to another exemplary embodiment of the disclosure.
[ notation ] to show
100: message transmission system
10: passerby for first weak
110: first moving device
112: positioning module
114: communication module
116: data storage device
118: processor with a memory having a plurality of memory cells
VH: vehicle with a steering wheel
S202 to S206, S300 to S318: process of message transmission method
20: road man for target weak
210: target moving device
TR: predetermined range
R1: the first section
R2: second section
R3: third section
15: passerby for the second weak
215: second moving device
A: crossing
N: north China
W: western medicine
Detailed Description
Some example embodiments of the disclosure will now be described in detail with reference to the drawings, wherein like reference numerals are used to refer to like or similar elements throughout the several views. These exemplary embodiments are only a part of the present invention and do not disclose all possible embodiments of the present disclosure. Rather, these example embodiments are merely examples of methods, systems, and mobile devices within the scope of the present disclosure.
Fig. 1 is a block diagram of a passerby message transmission system according to an exemplary embodiment of the present disclosure. First, fig. 1 first describes all the components and the configuration of the message transmission system, and the detailed functions will be disclosed together with the flow chart of the following exemplary embodiment.
Referring to fig. 1, the message transmission system 100 includes a plurality of mobile devices of road users and a plurality of vehicles, and for convenience of description, only one of the mobile devices of road users (i.e., the first mobile device 110 of the first road user 10) and one of the vehicles (i.e., the vehicle VH) are shown for detail, and the others can be similar.
The first mobile device 110 comprises at least a positioning module 112, a communication module 114, a memory 116, and a processor 118, wherein the processor 118 is coupled to the positioning module 112, the communication module 114, and the memory 116. The mobile device 110 may be a handheld electronic device such as a smart phone, a tablet computer, a personal digital assistant, or a wearable electronic device such as a smart watch, smart glasses, or a smart headset, which is not limited in this disclosure.
The Positioning module 112 is used to detect the location of the first Mobile device 110, and may be, for example, a Global Positioning System (GPS), a base station using a Global System for Mobile Communication (GSM) System, a Personal Handy-phone System (PHS), or a Code Division Multiple Access (CDMA) System, or a device for Positioning using a hotspot of Wireless compatibility authentication (Wi-Fi). It should be noted that, in the following description, the first mobile device 110 is located at the same position as the first vulnerable road man.
The communication module 114 is used for receiving and transmitting messages, and may be, for example, a communication interface supporting IEEE 802.11p standard in the Vehicular Environment Wireless Access (WAVE) and Short Range communication (DSRC) technologies. In addition, wireless communication interfaces such as GSM communication protocol, PHS communication protocol, CDMA communication protocol, Wi-Fi communication protocol, WiMAX communication protocol, 3G/4G/5G communication protocol, LTE communication protocol, bluetooth, etc. may be further integrated into the communication module 114 according to the application requirements, and the disclosure is not limited thereto.
The memory 116 is used for storing buffered data, persistent data, and compiled program code for performing functions of the mobile device 110, and may be any form of non-transitory, volatile, or non-volatile memory.
The Processor 118 is used to control operations of various components of the mobile Device 110, and may be, for example, a Central Processing Unit (CPU), or other Programmable general purpose or special purpose Microprocessor (Microprocessor), a Digital Signal Processor (DSP), a Programmable Controller (Programmable Controller), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), an Application Processor (AP), or other similar devices or combinations thereof.
It will be apparent to those skilled in the art that in order to achieve communication between the vehicle VH and the vulnerable road man 10, there will be elements in the vehicle VH corresponding to the first mobile device 110. In the present exemplary embodiment, a standard Message Set (Message Set) required for various road safety applications defined in SAE J2735 is used. Here, the vehicle VH may obtain its own location information through its own positioning module (not shown), and periodically broadcast Basic Safety Message (BSM) packets to the neighboring first vulnerable road users 10 through the communication module (not shown) by DSRC, wherein the BSM packets include information such as ID, longitude and latitude, vehicle speed, and direction of the vehicle VH. On the other hand, the first mobile device 110 of the first weak road user 10 also broadcasts the PSM packet including the ID, longitude and latitude, speed, direction, route, etc. information of the first mobile device 110 to the vehicle VH and other adjacent weak road users periodically through the communication module 114.
In addition, the first mobile device 110 may include an alert module (not shown). When the processor 118 determines that a collision is imminent based on the received BSM packet, the warning module may alert the vulnerable road users 10 in a manner of vibration, sound, light, etc. to avoid the collision. Similarly, the vehicle VH may also include an alert module (not shown). When the processor (not shown) of the vehicle VH determines that a collision is imminent according to the received PSM packet, the warning module may sound, light, or the like to remind the driver of the vehicle VH to avoid the collision.
In this example, in an intersection having two lanes in each traffic direction, it is assumed that the communication range is 250 meters and each traffic direction has 50 vehicles to communicate. With a QPSK3/4 coding transmission rate of 9Mbps and an actual bandwidth usage rate of 0.7 in the air, the total available bandwidth QPSK3/4 is 9Mbps × 0.7 is 6.3 Mbps. For a BSM packet with a typical average packet length of 300 bytes, assuming that each vehicle broadcasts a message every 100ms (i.e., with a frequency of 10Hz), the bandwidth used by all vehicles at the intersection will be 200 vehicles × 10Hz × 300 bytes × 8 bits — 4.8Mbps, and the remaining available bandwidth will only be (6.3-4.8) × 10 bits662 weak road users are used for safety message transmission (10Hz 300byte 8 bit). Therefore, when there are more than 62 road users in the intersection, the message data amount will exceed the network bandwidth load and cause network congestion. Therefore, the following exemplary embodiments will be described in conjunction with the system of fig. 1 to describe a mechanism for dynamically adjusting the PSM packet transmission of a road user with weak traffic to effectively avoid network congestion.
Fig. 2 is a flowchart illustrating a method for transmitting a message of a road user with weak condition according to an exemplary embodiment of the disclosure, and the steps of fig. 2 may be implemented by the secure message transmission system 100 of fig. 1. It is noted that the process of fig. 2 may be performed when the processor 118 of the first mobile device 110 detects that the first vulnerable road user 10 is moving from indoors to outdoors. In other exemplary embodiments, the process of fig. 2 may be executed by the processor 118 according to the time point of the first vulnerable road user 10, the specific time of day, the dangerous road segment detected by the first vulnerable road user 10, and the like, which is not limited by the disclosure.
Referring to fig. 1 and 2, first, the processor 118 of the first mobile device 110 determines whether a target mobile device of the target road weak user exists in the predetermined range of the first road weak user 10 (step S202). The target mobile device of the target road-bound for disadvantaged use herein refers to other mobile devices that have broadcast the personal safety message, and the predetermined range herein may be a predetermined angle range in front of the first road-bound for disadvantaged use 10. In other words, the processor 118 may determine whether the mobile device is located in the predetermined angle range in front of the first vulnerable road user 10 when the communication module 114 receives the personal safety message broadcast by the other mobile device. If so, the processor 118 will directly determine that the target mobile device is present within the predetermined range. In another exemplary embodiment, the processor 118 may further determine whether other mobile devices in the predetermined range have the same traveling direction within the allowable deviation angle range as the first mobile device 10, and if so, determine that the target mobile device exists in the predetermined range.
When the processor 118 determines that the target mobile device of the target road user is not present in the predetermined range, the processor 118 broadcasts the first personal safety message through the communication module 114 (step S204). The first personal safety message is the personal safety message of the first mobile device 110, and the vehicle VH and other mobile devices in the safety message transmission system 100 will receive the first personal safety message broadcast by the first mobile device 110. It should be noted that it is assumed that the communication module 114 does not receive any personal security message broadcast by other mobile devices, and also belongs to a range where the target mobile device does not exist in the predetermined range.
On the other hand, when the processor 118 determines that the target mobile device of the target road user is present in the predetermined range, the processor 118 determines whether to broadcast the first personal safety message according to the relative distance between the target mobile device and the intersection and the relative distance between the target mobile device and the first mobile device 110 (step S206). Here, the processor 118 determines the location information of the target mobile device according to the received personal security message, and obtains the location information of the first mobile device 110 according to the positioning module 112. The processor 118 can further determine the position Information of the intersection by using a Geographic Information System (GIS) Map or by obtaining a Signal Phase and Time (SPaT) and Map Information (Map Data) through the communication module 114. In this way, the processor 118 can determine whether the first mobile device needs to broadcast the first personal safety message according to the relative distance between the target mobile device and the intersection and the relative distance between the target mobile device and the first mobile device 110. The examples given below will be described in more detail with respect to this step.
Fig. 3 is a flowchart illustrating a method for transmitting a safety message of a road user with weak condition according to another exemplary embodiment of the disclosure, and the steps of fig. 3 may be implemented by the safety message transmission system 100 of fig. 1.
Referring to fig. 1 and fig. 3, in the exemplary embodiment, the processor 118 of the first mobile device 110 first determines whether the first vulnerable road user 10 is moving (step S302). Here, the processor 118 may determine whether the first handicapped road user is moving according to whether the location module 112 detects that the first mobile device 110 is located at a different position in a continuous time or according to an additional motion sensor (not shown) installed on the first mobile device 110. When the processor 118 determines that the first vulnerable road user 10 is not moving, the processor 118 will further determine whether a target mobile device of the target vulnerable road user exists within a predetermined range of the first vulnerable road user 10 (step S304) to determine whether to broadcast the first personal safety message. The target mobile device is the other mobile devices that have broadcast the personal security message in the previous paragraph.
When the processor 118 determines that the target mobile device of the target road user is not present in the predetermined range, the processor 118 broadcasts the first personal safety message through the communication module 114 (step S306). On the other hand, when the processor 118 determines that there is a target mobile device broadcasting the personal safety message in the predetermined range, the communication module 114 will not broadcast the first personal safety message (step S308) because the first disadvantaged road user 10 is stationary and has a low probability of collision, so as to reduce the transmission amount of the network.
For example, fig. 4 is a schematic diagram illustrating a safety message transmission system for passers-by according to an exemplary embodiment of the disclosure.
Referring to fig. 4, it is assumed that the predetermined range of the first vulnerable road man 10 is the front range R1-R3, and the target mobile device 210 of the target vulnerable road man 20 broadcasting the personal safety message exists in the range. Therefore, the first mobile device 110 will not broadcast the first personal safety message.
In another exemplary embodiment, the predetermined range may be further subdivided into a plurality of segments to more carefully determine whether to broadcast the first personal safety message. Taking fig. 4 as an example, assume that the first disadvantaged road man 10 is located in the first section R1. Here, the processor 118 determines that the target mobile device 210 is located in the third section R3 but not in the same first section R1 as the first mobile device 110, so the processor 118 will still broadcast the first personal safety message through the communication module 114 to take into account the possibility that the first disadvantaged road man 10 located in the first section R1 and the target disadvantaged road man 20 located in the third section R3 will move in different directions after walking continuously. In other words, in this exemplary embodiment, under the premise that the sending amount of the personal safety message is controlled, at least one person in each of the segments R1, R2, R3 broadcasts the personal safety message to provide more accurate personal safety message for the vehicle VH.
Referring back to fig. 3, similar to steps S202 to S204, when the processor 118 determines that the first weak road man 10 is moving, the processor 118 determines whether there is a target weak road man in the same traveling direction as the first weak road man 10 among the predetermined range of the first weak road man 10 (step S310), wherein the processor 118 tolerates a deviation within the angle range in the process of determining the traveling direction. When there is no target road man with weakness in the same traveling direction as the first road man with weakness 10 in the predetermined range, the processor 118 broadcasts the first personal safety message through the communication module 114 (step S316).
On the other hand, when there is a target road man for weak traffic in the same traveling direction as the first road man for weak traffic 10 within the predetermined range, the processor 118 will determine whether the relative distance between the target mobile device and the intersection is smaller than the relative distance between the first mobile device 110 and the intersection (step S312). When the relative distance between the target mobile device and the intersection is not less than the relative distance between the first mobile device 110 and the intersection, which means that the first mobile device 110 is closer to the intersection than the target mobile device, and the collision probability of the first mobile device 110 is higher, the communication module 114 broadcasts the first personal safety message (step S316) to prevent the first disadvantaged road user 10 from being collided with by the vehicle VH.
When the relative distance between the target mobile device and the intersection is smaller than the relative distance between the first mobile device 110 and the intersection, which means that the target mobile device is closer to the intersection than the first mobile device 110, the processor 114 further determines whether the relative distance between the target mobile device and the first mobile device 110 is smaller than the predetermined distance (step S314). The predetermined distance may be a fixed value pre-stored in the memory 116, or a dynamic adjustment value generated by the processor 114 according to the moving speed of the first mobile apparatus 110 or other parameters. If the determination in step S314 is yes, which means that the first mobile device 110 is close to the target mobile device, the communication module 114 does not need to broadcast the first personal safety message (step S318). If the determination in step S314 is negative, it means that the distance between the first mobile device 110 and the target mobile device is not close enough to avoid the first disadvantaged road-user 10 from being collided with by the vehicle VH, and therefore the communication module 114 still broadcasts the first personal safety message (step S316).
For example, fig. 5 is a schematic diagram illustrating a traffic message transmission system according to an exemplary embodiment of the disclosure.
Assume that the predetermined range of the first weak road man 10 is a range TR with an angle of 30 degrees in front thereof, and that there is a target moving device 210 of the target weak road man 20 that has broadcast the personal safety message in the range TR, wherein the traveling directions of the target weak road man 20 and the first weak road man 10 are the same (both are north N). Further, the second weak road man 15 is not in the range TR and is different from the traveling direction of the first weak road man 10 (westward W), so the second weak road man 15 will not be regarded as being located in the predetermined range of the first weak road man 10. Assume that the preset distance is 1 meter. Based on the target vulnerable road man 20 being closer to the intersection a than the first vulnerable road man 10 and the relative distance between the first vulnerable road man 10 and the target vulnerable road man 20 being 0.6 m (i.e., less than the preset distance of 1 m), the first mobile device 110 will not broadcast the first personal safety message.
Fig. 6 is a schematic diagram illustrating a traffic message transmission system according to another exemplary embodiment of the disclosure.
Assuming that the predetermined range TR of the first and second weak road users 10 and 15 is a range of 30 degrees ahead thereof, and the target moving device 210 of the target weak road user 20 broadcasting the personal safety message exists in the predetermined range TR, the traveling direction of the target weak road user 20 is the same as that of the first and second weak road users 10 and 15. Based on the target vulnerable road man 20 being closer to the intersection a than the first and second vulnerable road men 10 and 15 and the relative distances between the first and second vulnerable road men 10 and 15 and the target vulnerable road man 20 being less than the preset distance, the first and second mobile devices 110 and 215 will not broadcast the personal safety message.
Referring back to fig. 3, after the processor 118 completes steps S306, S308, S316 or S318, the process proceeds to step S300 to return to step S302 for another security message transmission process, and the time for the processor 118 to proceed to step S300 may be, for example, about once every 0.1 second.
In summary, the method for transmitting safety messages of a road user with weak potential, the mobile device and the system thereof according to the present disclosure determine the potential collision risk degree of the mobile device when the mobile device of the road user with weak potential receives the personal safety messages of other target mobile devices with high collision risk, so as to determine whether to broadcast the personal safety messages. Based on the above, the present disclosure can reduce the sending amount of the personal safety message to effectively avoid network congestion, and the weak road users can still keep the same road safety level, and further save the power consumption of the mobile device to improve the competitive advantage of the product value.
Although the present disclosure has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the present disclosure, and therefore, the scope of the present disclosure should be determined only by the appended claims.
Claims (20)
1. A method for transmitting a message of a road man with weak condition, which is applied to a first mobile device of a first road man with weak condition, the method comprising the steps of:
determining, by the first mobile device, whether a target mobile device exists within a predetermined range of the first vulnerable road user, wherein the target mobile device has broadcast a personal security message;
when the target mobile device exists in the predetermined range, the first mobile device judges whether to broadcast a first personal safety message according to the relative distance between the target mobile device and the intersection and the other relative distance between the target mobile device and the first mobile device, wherein the first personal safety message is the personal safety message of the first mobile device; and
broadcasting the first personal safety message by the first mobile device when the target mobile device does not exist in the predetermined range.
2. The method of claim 1, wherein the step of determining by the first mobile device whether the target mobile device is present within the predetermined range of the first vulnerable road-man comprises:
when the first mobile device receives the personal safety message of another mobile device of another road man with weak tendency, the first mobile device judges whether the another mobile device is positioned in a preset angle range in front of the first road man with weak tendency, so as to judge whether the target mobile device exists in the preset range.
3. The method of claim 2, wherein the step of determining by the first mobile device whether the target mobile device is present within the predetermined range of the first vulnerable road-man further comprises:
the first mobile device determines whether the traveling direction of the other road man for weak is the same as the traveling direction of the first road man for weak, so as to determine whether the target mobile device exists in the predetermined range.
4. The method of claim 1, wherein the step of determining by the first mobile device whether the target mobile device is present within the predetermined range of the first vulnerable road-man comprises:
when no personal safety message is received, the first mobile device determines that the target mobile device does not exist in the predetermined range of the first vulnerable road user.
5. The method of claim 1, wherein the step of determining whether to broadcast the first personal safety message by the first mobile device according to the relative distance between the target mobile device and the intersection and the another relative distance between the target mobile device and the first mobile device comprises:
judging whether the relative distance between the target mobile device and the intersection is smaller than the relative distance between the first mobile device and the intersection by the first mobile device;
when the first mobile device determines that the relative distance between the target mobile device and the intersection is smaller than the relative distance between the first mobile device and the intersection, the first mobile device determines whether the other relative distance between the target mobile device and the first mobile device is smaller than a preset distance; and
when the first mobile device determines that the other relative distance between the target mobile device and the first mobile device is smaller than the preset distance, the first mobile device does not broadcast the first personal safety message.
6. The method of claim 5, further comprising:
when the first mobile device determines that the relative distance between the target mobile device and the intersection is not less than the relative distance between the first mobile device and the intersection, the first personal safety message is broadcasted by the first mobile device.
7. The method of claim 5, further comprising:
when the first mobile device determines that the other relative distance between the target mobile device and the first mobile device is not less than the preset distance, the first personal safety message is broadcasted by the first mobile device.
8. The method of claim 5, wherein prior to the step of determining by the first mobile device whether the first vulnerable road-holder has the target mobile device within the predetermined range, the method further comprises:
judging whether the first weak road user is moving by the first mobile device;
when the first mobile device determines that the first road user with weakness is not moving, the first mobile device determines whether the target mobile device exists in the predetermined range of the first road user with weakness, so as to determine whether to broadcast the first personal safety message.
9. The method of claim 8, further comprising:
when the first mobile device determines that the target mobile device exists within the predetermined range, the first mobile device does not broadcast the first personal safety message; and
when the first mobile device determines that the target mobile device does not exist in the predetermined range, the first personal safety message is broadcast by the first mobile device.
10. The method of claim 8, wherein the predetermined range includes a plurality of segments, the first vulnerable road man being located in a first one of the segments, and the method further comprising:
when the first mobile device determines that the target mobile device exists in the first section of the predetermined range, the first mobile device does not broadcast the first personal safety message; and
when the first mobile device determines that the target mobile device does not exist in the first section of the predetermined range, the first personal safety message is broadcast by the first mobile device.
11. A mobile device held by a first vulnerable road occupant and comprising:
the positioning module is used for detecting the position of the mobile device;
a communication module for broadcasting and receiving messages;
a memory to store data; and
a processor coupled to the positioning module, the communication module, and the memory, wherein:
the processor determining whether a target mobile device exists within a predetermined range of the first vulnerable road user, wherein the target mobile device has broadcast a personal safety message;
when the processor determines that the target mobile device exists in the predetermined range, the processor judges whether to broadcast a first personal safety message according to the relative distance between the target mobile device and the intersection and the other relative distance between the target mobile device and the mobile device, wherein the first personal safety message is the personal safety message of the mobile device; and
when the processor determines that the target mobile device does not exist in the predetermined range, the processor broadcasts the first personal safety message through the communication module.
12. The mobile device as claimed in claim 11, wherein when the processor determines that the other mobile device is located in a predetermined angle range in front of the first handicap passerby according to the personal security message of the other mobile device of the other handicap passerby received through the communication module, the processor determines whether the target mobile device exists in the predetermined range.
13. The mobile device as claimed in claim 12, wherein the processor further determines whether the traveling direction of the another road user with weakness is the same as the traveling direction of the first road user with weakness, so as to determine whether the target mobile device exists in the predetermined range.
14. The mobile device of claim 11, wherein the processor determines that the target mobile device is not present within the predetermined range of the first vulnerable road user when the communication module does not receive any personal security message.
15. The mobile device of claim 11, wherein:
the processor judges whether the relative distance between the target mobile device and the intersection is smaller than the relative distance between the mobile device and the intersection;
when the processor determines that the relative distance between the target mobile device and the intersection is not less than the relative distance between the mobile device and the intersection, the processor broadcasts the first personal safety message through the communication module;
when the processor determines that the relative distance between the target mobile device and the intersection is smaller than the relative distance between the mobile device and the intersection, the processor determines whether the other relative distance between the target mobile device and the mobile device is smaller than a preset distance;
when the processor determines that the other relative distance between the target mobile device and the mobile device is smaller than the preset distance, the processor does not broadcast the first personal safety message through the communication module;
when the processor determines that the relative distance between the target mobile device and the intersection is not less than the other relative distance between the mobile device and the intersection, the processor broadcasts the first personal safety message through the communication module.
16. The mobile device as claimed in claim 15, wherein the processor further determines whether the first vulnerable road user is moving, and when the processor determines that the first vulnerable road user is not moving, the processor determines whether the target mobile device exists within the predetermined range of the first vulnerable road user, thereby determining whether to broadcast the first personal safety message through the communication module.
17. The mobile device as claimed in claim 16, wherein the processor does not broadcast the first personal safety message through the communication module when the processor determines that the target mobile device is present within the predetermined range, and broadcasts the first personal safety message through the communication module when the processor determines that the target mobile device is not present within the predetermined range.
18. The mobile device of claim 16, wherein the predetermined range includes a plurality of segments, the first disadvantaged road user is located in a first one of the segments, the processor does not broadcast the first personal safety message via the communication module when the processor determines that the target mobile device is present in the first segment of the predetermined range, and broadcasts the first personal safety message via the communication module when the processor determines that the target mobile device is not present in the first segment of the predetermined range.
19. A message transmission system for vulnerable road users, comprising:
at least one vehicle; and
at least one mobility device for a handicap passerby, comprising a first mobility device for a first handicap passerby, wherein:
the first mobile device determining whether a target mobile device exists within a predetermined range of the first vulnerable road user, wherein the target mobile device has broadcast a personal safety message to the vehicle and the first mobile device;
when the target mobile device exists in the predetermined range, the first mobile device judges whether to broadcast a first personal safety message according to the relative distance between the target mobile device and the intersection and the other relative distance between the target mobile device and the first mobile device, wherein the first personal safety message is the personal safety message of the first mobile device; and
when the target mobile device does not exist in the predetermined range, the first mobile device broadcasts the first personal safety message to the mobile devices of the vehicle and other road disadvantaged persons.
20. The system of claim 19 wherein the first mobile device further determines whether the first vulnerable road user is moving, and when the first mobile device determines that the first vulnerable road user is not moving, the first mobile device further determines whether the target mobile device is within the predetermined range of the first vulnerable road user to determine whether to broadcast the first personal safety message.
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